JP2012250459A - Multilayer film and method for producing the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a multilayer film, which looks as if an emboss and handle are synchronized with each other and has a high design property.SOLUTION: In the multilayer film 10, a film, produced by layering a colored layer 104 and a surface transparent layer 106 in this order on a substrate concealment layer 102, is subjected to embossing E, and all of the following conditions (a) to (d) are satisfied. In the condition (a), the L* value of the substrate concealment layer 102 is larger than that of the colored layer 104, and a difference between the L* values of both layers is ≥30. In the condition (b), the thickness of the substrate concealment layer 102 is 50-300 μm. In the condition (c), the thickness of the surface transparent layer 106 is 50-200 μm. In the condition (d), the embossment depth is 30-100% of the thickness of the multilayer film.

Description

  The present invention relates to an embossed laminated film, and more particularly to a laminated film with high design that looks as if the embossing and the handle are synchronized, and a method for producing the laminated film.

  2. Description of the Related Art Conventionally, there is a demand for highly design films as decorative materials for building materials, wall layer materials, furniture, home appliances, and the like. As the method, there is so-called synchronized embossing in which the printed pattern and the embossed unevenness are synchronized in addition to printing and wiping.

  As a method of forming synchronized embossing, a foaming agent is added to the printing ink used for printing, and a portion corresponding to the pattern is made convex, or a liquid repellent is added to the printing ink, and a top coat layer is formed on this printing surface. Provide a pattern by forming a topcoat layer with a concave part corresponding to the pattern due to the liquid repellency of the printing layer, or by adding a curing inhibitor to the printing ink and providing a topcoat layer on this printed surface There is a method of forming a top coat layer in which the corresponding part is uncured and concave.

  In addition, as a method of synchronizing the printed pattern and the embossing, a flat plate type embossing device is used to form the embossed plate having the same dimensions as the printed pattern, or in a continuous embossing device, the film dimensions A method for suppressing the change (Patent Document 1) and a method by mechanical control of an embossing machine (Patent Documents 2 and 3) are known.

  However, none of the conventional methods of synchronizing the printed pattern and the embossment has a difficulty in synchronizing the printed pattern and the embossed pattern, and has not been easily implemented.

JP-A-61-046881 JP-A 63-286389 JP-A-7-276497

  Then, the objective of this invention is providing the manufacturing method of a highly designable laminated | multilayer film and the laminated | multilayer film which appear as if the embossing and the handle | synchronization are synchronizing with a simple method.

  In the film configuration in which the colored layer and the transparent surface layer are laminated in this order on the underlying concealing layer, the inventor makes the L * values of the underlying concealing layer and the coloring layer have a specific relationship, and It has been found that the above object can be achieved by specifying the thickness and further specifying the embossing depth.

That is, the present invention is as follows.
1. A laminated film characterized by embossing a film in which a colored layer and a transparent surface layer are laminated in this order on a base concealing layer, and satisfying all the following conditions (a) to (d).
(A) The L * value of the base concealing layer is larger than the L * value of the colored layer, and the difference between the two L * values is 30 or more.
(B) The base concealing layer has a thickness of 50 μm to 300 μm.
(C) The surface transparent layer has a thickness of 50 μm to 200 μm.
(D) The emboss depth is 30% to 100% of the laminated film thickness.
2. 2. The laminated film according to 1 above, wherein the base concealing layer has an L * value of 50 to 100.
3. 3. The laminated film as described in 1 or 2 above, wherein the difference between the L * value of the base concealing layer and the L * value of the colored layer is 50 or more.
4). A process for embossing a film in which a colored layer and a surface transparent layer are laminated in this order on a base concealing layer, and satisfying all of the following conditions (a) to (d): Method.
(A) The L * value of the base concealing layer is larger than the L * value of the colored layer, and the difference between the two L * values is 30 or more.
(B) The base concealing layer has a thickness of 50 μm to 300 μm.
(C) The surface transparent layer has a thickness of 50 μm to 200 μm.
(D) The emboss depth is 30% to 100% of the laminated film thickness.
5. 5. The method for producing a laminated film as described in 4 above, wherein the L * value of the base concealing layer is 50 to 100.
6). 6. The method for producing a laminated film as described in 4 or 5 above, wherein the difference between the L * value of the base concealing layer and the L * value of the colored layer is 50 or more.

ADVANTAGE OF THE INVENTION According to this invention, the laminated | multilayer film which has the design feeling which looks as if the embossing and the pattern are synchronizing can be obtained, without the process with the high difficulty which synchronizes printing and embossing is unnecessary.
The laminated film of the present invention is obtained by embossing a film in which a colored layer and a transparent surface layer are laminated in this order on a base concealing layer. In the embossed film, each layer is stretched in the concave portion, and the film thickness is thinner than other portions. In this case, if the L * value (brightness) of the base concealing layer and the colored layer is lower than the base concealing layer by a certain value or more (if it is dark), the base layer will extend beyond the stretched colored layer. The concealing layer can be seen through, and the contrast between the base concealing layer and the colored layer makes it look as if it has been printed. Furthermore, since it is synchronized with the embossing, a very high design can be obtained.

It is sectional drawing of one Embodiment of the laminated | multilayer film of this invention.

Hereinafter, the present invention will be described in more detail.
FIG. 1 is a cross-sectional view of an embodiment of the laminated film of the present invention. In FIG. 1, a laminated film 10 of the present invention is formed by embossing E on a film in which a colored layer 104 and a surface transparent layer 106 are laminated in this order on a base concealing layer 102. The laminated film 10 of the present invention is bonded onto the substrate P so that the substrate P and the base concealing layer 102 are in contact with each other or through a coating layer such as an adhesive, an adhesive, and a primer.
Hereinafter, each layer will be described.

(1) Base concealment layer The material of the base concealment layer 102 in the present invention is not particularly limited, and papers, nonwoven fabrics, and resins can be used. Among them, resins having good processability are suitable, for example, olefin resin, polyester resin, acrylic resin, vinyl chloride resin, styrene resin, etc. Among them, vinyl chloride resin excellent in embossability is mentioned. Preferably used.

In the present invention, the L * value of the base concealing layer 102 needs to be larger than the L * value of the colored layer 104 described below. Also, the difference between the L * values of both needs to be 30 or more.
When the L * value of the base concealing layer 102 is smaller than the L * value of the colored layer 104 described below, there is a problem that a design feeling as if the embossing and the pattern are synchronized cannot be obtained.
When the difference between the L * value of the base concealing layer 102 and the L * value of the colored layer 104 is 30 or more, the contrast of the embossed recesses becomes clear, and an appearance with high design properties is obtained. Conversely, if the difference between the two is less than 30, the effect is not achieved. In the present invention, the difference between the L * values of the two is more preferably 50 or more.
Further, the L * value of the base concealing layer 102 is preferably 50 to 100, and more preferably 60 to 100.

  The L * value is a well-known scale that represents lightness, which is the degree of color brightness, and can be measured according to JIS Z8722 or the like. The greater the L * value, the higher the brightness, and the maximum L * value, that is, L * value = 100 means white, and the minimum L * value, that is, L * value = 0 means black.

  Further, the thickness of the base concealing layer 102 is required to be 50 μm to 300 μm, and preferably 50 μm to 200 μm. When the thickness of the base concealing layer 102 is less than 50 μm, a design feeling as if the embossing and the pattern are synchronized cannot be obtained due to insufficient thickness. On the other hand, when the thickness exceeds 300 μm, thickness unevenness occurs in the base concealing layer, thereby making the concealing performance non-uniform, which is not preferable.

(2) Colored layer The colored layer 104 can be formed by a coated or formed film.
In the method by coating, a colored layer 104 can be formed by adding a colorant to a resin component such as vinyl chloride, polyester, or acrylic and coating by a known method. At this time, if adhesion performance is imparted to the colored layer 104, it is possible to have an effect of enabling lamination of base materials having insufficient adhesive strength only by heat of embossing.
The formed film can be formed by a known method such as calendering or T-die extrusion, and the resin component may be appropriately selected in consideration of the materials of the base concealing layer 102 and the surface transparent layer 106. The colored layer 104 is desirably the same type of composition as the resin composition of the base concealing layer 102 and / or the surface transparent layer 106 in terms of processability and adhesiveness. The colored layer 104 can also be formed by coextrusion with the base concealing layer 102 or the surface transparent layer 106.

In the present invention, the relationship between the L * value of the base concealing layer 102 and the L * value of the colored layer 104 is as described above. The L * value of the colored layer 104 is preferably 0-50.
From the viewpoint of the effect of the present invention, the thickness of the colored layer 104 is preferably 0.01 μm to 30 μm, and more preferably 0.01 μm to 20 μm.

(3) Surface transparent layer As the surface transparent layer 106, what is necessary is just to be transparent and have the embossing suitability, and what is necessary is just to use a well-known transparent resin film according to a use. Examples of the resin include olefin resins, ester resins, acrylic resins, fluorine resins, vinyl chloride resins, styrene resins, and the like. Moreover, the multilayer structure by the same kind or different kind of resin of a transparent resin film may be sufficient.
Among the above resin films, a vinyl chloride resin is preferable from the viewpoint of embossing.

  Moreover, the thickness of the surface transparent layer 106 needs to be 50 micrometers-200 micrometers, and it is preferable that it is 50 micrometers-150 micrometers. If the thickness of the surface transparent layer 106 is less than 50 μm, a design feeling as if the embossing and the pattern are synchronized cannot be obtained. On the other hand, when the thickness exceeds 200 μm, the thickness of the surface transparent layer is uneven, which causes a streak defect when a laminated film is formed.

  Here, the thicknesses of the base concealing layer 102, the colored layer 104, and the surface transparent layer 106 mean the thicknesses of the respective layers before embossing.

  The laminated film of the present invention can be produced by laminating the above-described base concealing layer 102, the colored layer 104 and the surface transparent layer 106 in this order and subjecting this film to embossing. There is no restriction | limiting in particular in the method of embossing, For example, it can carry out using well-known embossing machines, such as a drum heating type embosser and a multi-cylinder type embosser.

  The base concealing layer 102, the colored layer 104 and the surface transparent layer 106 may be directly laminated by an embossing machine and embossed, and the colored layer 104 may be applied to the base concealing layer 102 and / or the surface transparent layer 106 in advance. After laminating, the substrate may be laminated with an embossing machine with an embossing machine and embossed, and the underlying concealing layer 102, the colored layer 104, and the surface transparent layer 106 may be preliminarily formed using an adhesive colored layer. Embossing may be performed by an embossing machine after creating a three-layer component.

Moreover, the embossing depth of the laminated film 10 of the present invention needs to be 30% to 100% of the thickness of the laminated film 10. When the embossing depth is less than 30%, the colored layer 104 is stretched less and the underlayer hiding layer 102 is not transparent. As a result, it does not look like printing, and a synchronized design feeling cannot be obtained. On the other hand, if it exceeds 100%, a hole is formed in the film itself or back embossing (unevenness on the back surface) becomes large, which is not suitable as a product. The embossing depth of the laminated film 10 of the present invention is preferably 50% to 100% from the viewpoint of the effect of the present invention.
The embossing depth can be adjusted by adjusting the depth of the embossing roll.
In addition, the embossing depth measured the Rz (maximum height) of the surface of the laminated | multilayer film 10 according to the method prescribed | regulated to JISB0601, and represented it with the percentage of Rz with respect to the laminated | multilayer film thickness before giving embossing.

  Hereinafter, although an example and a comparative example explain the present invention further, the present invention is not limited to these examples.

Example 1
A vinyl chloride resin film (S23108Fc56095, manufactured by Riken Technos Co., Ltd.) having an L * value of 90 and a thickness of 80 μm was used as the base concealing layer, and an L * value of 10 and a thickness of 2 μm were used as a colored layer on the base concealing layer. The coating layer was formed using a gravure coater. A vinyl chloride resin film (S20131Fc025, manufactured by Riken Technos Co., Ltd.) having a thickness of 80 μm as a surface transparent layer is laminated on the colored layer side of the obtained film with an embossing machine and embossed so that the embossing depth becomes 63%. A laminated film was obtained.

About the obtained laminated | multilayer film, the following evaluation was performed and the result was put together in Table 1.
(1) Sense of synchronized design Ten test subjects judged whether the emboss and the pattern seem to be synchronized, and evaluated according to the following criteria.
○: It is judged that 8 or more people seem to be in sync. Δ: 7 to 4 people are judged to be in sync. ×: 3 or less people are judged to be in sync.

(2) Coating processability on the back side By applying an adhesive on the base concealing layer side (the surface opposite to the colored layer forming surface) of the laminated film and applying it to a stainless steel plate, The coating processability on the back surface was evaluated.
○: Air is not included between the stainless steel plate and the adhesive, and construction can be performed without affecting the surface design. Δ: Some air is included between the stainless steel plate and the adhesive, and the surface design is slightly affected. ×: Stainless steel plate Contains a lot of air between the adhesive and the adhesive, which has a significant adverse effect on the surface design

(3) Thickness unevenness Ten test subjects confirmed visually, it was judged whether the stripe defect which can be judged to be the cause of thickness unevenness could be confirmed, and the following references | standards evaluated.
○: 2 or less people who judged that streak defects that can be judged to be due to uneven thickness were confirmed Δ: 7 to 3 people were judged to be able to confirm streak defects that could be judged to be caused by uneven thickness x: 8 or more people were thick Judge that streak defects that can be attributed to unevenness can be confirmed

  The results are shown in Table 1.

Example 2
A vinyl chloride resin film (S23108Fc57991, manufactured by Riken Technos Co., Ltd.) having an L * value of 70 and a thickness of 80 μm was used as the base concealing layer. Otherwise, Example 1 was repeated.

Example 3
A vinyl chloride resin film (S23106Fc93315, manufactured by Riken Technos Co., Ltd.) having an L * value of 50 and a thickness of 80 μm was used as the base concealing layer. Otherwise, Example 1 was repeated.

Examples 4-5
Example 1 was repeated except that the L * value of the colored layer was changed as shown in Table 1 by adjusting the color tone of the colored layer.

Examples 6-8
Example 1 was repeated except that the embossing depth was changed as shown in Table 1.

Examples 9-12
Example 1 was repeated except that the thickness of the surface transparent layer and the base concealing layer and the embossing depth were set as shown in Table 1.

Example 13
Example 1 was repeated except that the colored layer was a colored adhesive in which the L * value was adjusted to 10 by adding the colorant to the adhesive.

  The results of the above examples are shown in Table 1.

Comparative Example 1
A laminated film was prepared and evaluated under the same conditions as in Example 1 except that the embossing depth was set to 25%. When the embossing was shallow, the colored layer was insufficiently stretched, and the color tone of the underlying concealing layer was Since it was not sufficiently transparent, a printing feeling did not appear, and the synchronized design feeling was inferior.

Comparative Example 2
A laminated film was prepared and evaluated under the same conditions as in Example 1 except that the embossing depth was 113%. When the evaluation was carried out, the embossing was too deep, severe irregularities occurred on the back surface of the base concealing layer, and the back surface was coated. In some cases, a large amount of coat loss occurred.

Comparative Example 3
A laminated film was prepared under the same conditions as in Example 1, except that a vinyl chloride resin film (S23106Fc93134, manufactured by Riken Technos Co., Ltd.) having an L * value of 55 was used as the base concealing layer, and the L * value of the colored layer was set to 35. As a result of the evaluation, the difference in L * value between the base concealing layer and the colored layer was so small that no contrast was produced, resulting in poor print feeling and poor synchronized design.

Comparative Example 4
A laminated film was prepared and evaluated under the same conditions as in Example 1 except that a vinyl chloride resin color clear film having an L * value of 35 (S23106Fc93947, manufactured by Riken Technos Co., Ltd.) was used as a surface transparent layer without using a colored layer. As a result, the uneven thickness due to the bank mark of the color clear film was remarkable and the design was inferior.

Comparative Example 5
A laminated film was prepared under the same conditions as in Example 1 except that a vinyl chloride resin film (S23108Fc56095, manufactured by Riken Technos Co., Ltd.) having a thickness of 40 μm was used as the base concealing layer. As a result, the design feeling decreased and the synchronized design feeling deteriorated.

Comparative Example 6
A laminated film was prepared and evaluated under the same conditions as in Example 1 except that the thickness of the base concealing layer was 350 μm. When the evaluation was performed, the base concealing layer was too thick and uneven thickness occurred in the base concealing layer. The overall thickness became non-uniform, thereby concealing performance was non-uniform and the design feeling was lowered.

Comparative Example 7
A laminated film was prepared and evaluated under the same conditions as in Example 1 except that the thickness of the surface transparent layer was 40 μm. As a result, the film was too thin, resulting in increased thickness fluctuation and inferior tuned design. It became.

Comparative Example 8
A laminated film was prepared and evaluated under the same conditions as in Example 1 except that the thickness of the surface transparent layer was 250 μm. When the surface transparent layer was too thick, the thickness of the entire laminated film became uneven, and the back surface The coating processability of deteriorated.

  Table 2 shows the results of the above comparative examples.

  Since the laminated film of the present invention is a laminated film with high design that looks as if the embossing and the handle are synchronized, it can be suitably applied as a decorative material for building materials, wall layer materials, furniture, home appliances and the like.

DESCRIPTION OF SYMBOLS 10 Laminated film 102 Base concealment layer 104 Colored layer 106 Surface transparent layer P Base material

Claims (6)

A laminated film characterized by embossing a film in which a colored layer and a transparent surface layer are laminated in this order on a base concealing layer, and satisfying all the following conditions (a) to (d).
(A) The L * value of the base concealing layer is larger than the L * value of the colored layer, and the difference between the two L * values is 30 or more.
(B) The base concealing layer has a thickness of 50 μm to 300 μm.
(C) The surface transparent layer has a thickness of 50 μm to 200 μm.
(D) The emboss depth is 30% to 100% of the laminated film thickness.   The laminated film according to claim 1, wherein an L * value of the base concealing layer is 50 to 100.   The laminated film according to claim 1 or 2, wherein the difference between the L * value of the base concealing layer and the L * value of the colored layer is 50 or more. A process for embossing a film in which a colored layer and a surface transparent layer are laminated in this order on a base concealing layer, and satisfying all of the following conditions (a) to (d): Method.
(A) The L * value of the base concealing layer is larger than the L * value of the colored layer, and the difference between the two L * values is 30 or more.
(B) The base concealing layer has a thickness of 50 μm to 300 μm.
(C) The surface transparent layer has a thickness of 50 μm to 200 μm.
(D) The emboss depth is 30% to 100% of the laminated film thickness.   The method for producing a laminated film according to claim 4, wherein the L * value of the base concealing layer is 50 to 100.   6. The method for producing a laminated film according to claim 4, wherein the difference between the L * value of the base concealing layer and the L * value of the colored layer is 50 or more.

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